Focusing device



(L E. GODLEY. FOCUSING- DEVICE. APPUCATION FILED APR. 8, I922.

1,43%1 56. Patented Nov. 314, 1922.

Fatented Nov. 14, 1922 ire STATES CHARLES E. GODLEY, 035 DETROIT, MICHIGAN, ASSIGNOR TO EDIVIUNDS & JONES CORPORATION, OF DETROIT, MICHIGAN, A CORPORATION OF NEW YORK.

roousrne .nnvion Application filed April 8,

To all whom it may concern:

Be it known that I, CHARLES E. GODLEY, a citizen of the United States, and residing at Detroit, in the county of lVayne and State of Michigan, have invented a new and Improved Focusing Device, of which the following is. a specification.

This invention relates to-means for positioning the active or incandescent portion of electric light bulbs withreference to the foci of the reflectors of projecting lamps, and its object is to provide a device of this character whichshall be simple in construction, readily adjustable, and which can be made at low cost.

This invention consists, in combination with a support which may be the reflector itself or a lamp body in which the reflector is mounted, of a threaded thimble secured to the support. and having a bearing flange, a bushing screw-threadedinto the thimble and having a bearing flange parallel to that on the thimble, and aconncctor longitudinally movable relative to said bushing and having an external circumferential flange adapted to be gripped between the flanges on the thimble and bushing.

It further consist-s in a sleeve movably mounted on the connector, means to prevent the sleeve and connector from moving relat-ive to each other, and a flange on the sleeve extending between the flanges on the thimble and bushing.

It also consists of the details of construction illustrated in the accompanying drawing and particularly pointed out in the claims.

In the drawing, Fig. 1 is a central section of a reflector having a light bulb adjust-ably mounted at about its focus by means of my improved focusing attachment. Fig. 2 is a similar section showing the focusing attachment mounted in alamp body. Fig. 3 is a side elevation of the device shown in- Fig. 1. Fig. i is a modified form of the device shown in Fig. 1. Fig. 5 is a section on the line 5-5 of Fig. l.

Similar reference characters refer to like parts throughout the several views.

Electric light bulbs for lamps of the projecting type are often so made that the point of illumination is not in the axis of the base of the bulb and that therefore the point of illumination will not be at the focus of the reflector of the lamp when the bulb is posiparabolic type and has a central opening in its rear end and connected thereto is a thimble 2 formed with internal threads and having an inturned flange 3 and its edge 4: rolled around the edge of the reflector to unite the thimble thereto. The flange 3 is shown to fit theend of the reflector, although this is not necessary.

A bushing 5 screws into the thimble and has a flange 6 parallel to the flange 3 on the thimble. Its outer edge 7 is shown turned out and back and is preferably knurled as shown in Fig. 3 so that the bushing may be manually screwed into and out of the thimble. The light bulb 8 has abase 9 fitting the connector 10 into which the cable 12 extends. vThe connector is mounted in a sleeve 13 havinga flange let that extends betweenthe flanges 3 and (3 and is gripped thereby- A .well' known, spring 15 extends around the sleeve 13 and its end 16 is so bent as. to extend through the notch 17 in this sleeve and engage the connector 10 to hold it firmly in position. Merely slacking up the bushing 5 loosens the connector, which can be moved laterally until the illuminating portion 18 of the bulb filament is in the axis of the reflector. The connector 10 maybe slid. along in the sleeve 13.

In Fig. a a similar construction is shown, but the flange 20 on the bushing ill. the flange 22 on the bushing 23 and the flange 24 on the sleeve 25 are all radial.

In Fig. 2 a reflector 27 is shown mounted in a lamp body 28 and the reflector has a central opening 29 through which the connector30 extends. A lamp bulb 8 is mounted in the forward end of the connector. The rear end receives the coupling 32 which carries a cable The body 28 is formed with a cylindrical flange 3a which receives the internally threaded thimble which may be secured in position in any desired manner and has an inturned radial flange A bushing 37 is again employed and its flange 38 is carried into and outotl. engagement with the flange 39 on the sleeve 40 in which the connector is slidable against the friction created by the spring 16.

In the construction shown in Fig. 2, the connector 30 is longitudinally slidable in the sleeve 4:0 and this sleeve is movable to carry the light bulb 8 laterally in any direction when. the bushing 37 is unscrewed. The cost of this construction is very low as all the parts may be stamped from sheet metal.

The details and proportions oi this construction may all be changed without departing from the spirit of my invention as set forth in the following claims.

I claim 1. In. a focusing device :l'or projecting lan'ips, the combination of a lamp body having a circular opening a thimble attached to the body at the opening and consisting ol a cylhnlrical internally threaded portion and an inwardly extending flange at the inner end of the cylindrical portion, a bushing screw threaded into the thinible and having an inwardly extending flange parallel to the flange on the thiinble a tubular connector adapted to receive a connector plug in one end and a light bulb base in the other end, a circumferential flange connected with the tubular connector and adapted to fit between and be gripped by the flanges on the thiinble and bushing to position the light bulb when the bushing is secured into the thimble.

2. In a focusing device for projecting lamps the combination of a thimble attached to a portion of the lamp in substantial alinement with the axis of the reflector, and having an internally threaded cylindrical portion and an inwardly extending flange, a bushing screw-threaded in said thimble and having a flange parallel to the flange on, the thimble, a cylindrical connector, and a sleeve in which the connector is mounted and which is provided with a circumferential flange extending between the flanges on the thimble and bushing and parallel thereto.

In a focusing device for projecting lamps the combination or a. thimble adapted to be attached to a portion of the lamp in substantial alinementwith the axis of the reflector, said thiinble having an internally threaded cylindrical portion and an in- \vardly extending flange, a bushing screwthreaded in said thimble and having a flange parallel to the flange on the thimble, a cylindrical connector, a sleeve in which the connector is mounted and which is provided with a Cl1tl'ln1IFGTGJ1i3lill flange of even thickness throughout extending between the flanges 011 the thimble and lmshing and parallel thereto and means on the sleeve to firmly hold the connector from sliding in the sleeve.

4-,. In a focusing device for projecting la nips the combination of a reflector having an axial opening in its rear end, a thimble attached to the reflector at said opening in substantial a-linement with the axis of the reflector, said thinible having an internally threaded cylindrical portion and an inwardly extending flange fitting against the reflector a bushing screw-threaded in said thimble and. having a flange parallel to the flange on the thimble, a cylindrical connector, a sleeve in which the connector is slidably mounted. and which is provided with a circumferential flange extending between the flanges on the thimble and bushing, and means on the sleeve to '[irmly hold the connector from sliding in the sleeve.

CHARLES E. GODLEY. 

